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1. Callitriche Linnaeus, Sp. Pl. 2: 969. 1753.
水马齿属 shui ma chi shu
Morphological characters and geographical distribution are the same as those of the family.
The name Callitriche stagnalis Scopoli has been misapplied E of the Ural mountains of Russia. In China it has mainly been applied to C. fehmedianii. In 1966, Callitriche alata A. I. Baranov & Skvortsov was described, based on a single specimen. The description is insufficient to separate it from other taxa occurring in the region; few details of reproductive features are provided and could apply to C. fuscicarpa, C. palustris var. oryzetorum, or C. raveniana. The details of the holotype are also very sparse, and it is not clear how easy it might be to recognize it if it is represented in other herbaria.
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| 1 |
Fruit wingless |
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(2) |
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Fruit clearly winged |
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(4) |
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| 2 (1) |
Bracts lacking; fruits expanded at base to form ridge (strumose). |
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6 C. peploides |
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Bracts present; fruits not expanded at base |
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(3) |
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| 3 (2) |
Bracts large and ovate; leaf venation simple. |
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4 C. palustris |
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Bracts as long as fruit but narrow; leaf venation complex. |
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3 C. fuscicarpa |
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| 4 (1) |
Fruit widest in upper half, tapering from above midpoint to base |
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(5) |
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Fruit widest at or near middle |
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(6) |
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| 5 (4) |
Bracts lacking; leaves very uniform with 3 main veins. |
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5 C. japonica |
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Bracts present; leaves variable with 1 to many veins. |
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4 C. palustris |
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| 6 (4) |
Fruit winged only at top. |
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7 C. glareosa |
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Fruit winged all around |
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(7) |
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| 7 (6) |
Bracts lacking. |
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1 C. hermaphroditica |
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Bracts present |
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(8) |
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| 8 (7) |
Bracts shorter than 0.5 mm; leaves very uniform with 3 main veins. |
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8 C. raveniana |
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Bracts longer than 0.5 mm; leaves variable with 1 to many veins |
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(9) |
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| 9 (8) |
Wing of fruit narrower than 1 mm; dry fruits shorter than 1.1 mm. |
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3 C. fuscicarpa |
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Wing of fruit wider than 1 mm; dry fruits longer than 1.3 mm. |
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2 C. fehmedianii |
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List of lower taxa
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